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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '563785fa0caf6fae8becf92df92861e3e6477863c1891e9e99fab6fe3be4564c' 
  AND token = 'fv1NCrTMX/8ZDb1T5vtxS1B3gznhr7wn6IwVRk1dLhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}